binney



.R L. BINNEY.

MICROMETER.

APPLICATION FILED sum: 26, 29:5.

1,1953%; Patnted Aug. 22, 1916.

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I INVEIN'IZOR U ffTEn s rx'rusv rarest @WME.

, mm]; L. ernNEY, o'r'rori'nno, onro, ASS-IGNOR or ONE-HALF TO DAVID .LwELsH, or

v j .TOLEDO, 01110.

a citizen of the United States, and

j iurcr omnrnn,

To all whom it may concern..-

Be it known that I, RALPH L. BINNEY, a resident of Toledo,- in the county of Lucas and State of Ohio, have invented a certain new and useful-Micrometer; and I do hereby declare the following to be a full, clear, and exact "description of the invention, such-as will enable others skilled in the art to which it appertains to make and use thesame, reference being .had to the accompanying drawings, and to the characters of reference I .markedthereon, which form a part of this specification' My invention relates. to devices for determining the diameters of circular parts,-

and has for its object the provision of an improved device of this character whichis simple and eflicient in its construction and l the body or holder member of member being of bar-like or elongated form 'tions of such arms easily and quickly operable to accurately determine the diameter of circularparts.

The invention is fully described in the following specification, and while, in its broader aspect, it is capable of embodiment in numerous forms, a preferred embodiment thereof isillustrated in the following specification, in which,

Figure l is a central longitudinal section of "a device embodying the invention'with a work piece in operative position therein. Fig. 2 isan enlarged top'plan view thereof. an enlarged section of the device 'similar to Fig.1 with parts broken away,

and Fig. 4 is anenlarged sectional detail of aportionof the invention. I

eferring to'the drawings, 1' designates my tool, said in the present instance, and having the two arms 2, 2 projecting in opposite directions from one end thereof with the outer porpreferably extending in diverging planes; Each arm 2 has a series of holes 3, in the present instance, four in number, provided therethrough in'equidistantly spaced relation longitudinally-thereof, and each hole of one set is positioned for other set at a point on a line bisecting the fork-formed by the arms 2, 2, as indicated by the lines a and b in Fig.

The holes 3 in each arm, are preferabl of different sizes to\ respectively receive di ferent sized portions of a stepped stem 4.

Specification of Letters Patent.

Patented Aug. 22, 19116.

Application filed June 26, 1915. Serial No. 36,497.

carrying a work coacting part 5 at its inner work piece 6, the diameter of which is to be measured, is inserted between the parts 5, 5 as shown.

' The body portion 1 of the tool is provided at its inner. end with a socket 7 in which the inner end of a plunger 8 is mounted for limcompression sprin 9 encircles the. plunger within thesocket and has one end thrust against a shoulder 10 in the socket and its opposite end thrust against a collar 11 on lted reciprocatory movements. A coiled the plunger and tends to normally hold the plunger at the limit of its outward movement with said collar in contact witha plug '12, which partially closes the outer end of 'the socket and through which the outer end of the plunger projects. The plunger 8 alines with the line of bisection of the fork 2,2 with which the 'pointof intersection of the coaxial line 'of corresponding openings in the fork-arms coincide, as indicated by reference to Fig. 1. It is thus evident that a Work piece 6, when inserted between the contact parts 5, 5, will coact .with the outer end of the plunger 8 and force 1t lnward a greater or less extent against the tension of the spring 9, depending on the size of the work piece. v j The plunger 8 is provided at its mner end with a lengthwise projecting stem or bar 13 which extends into a restricted end-portion of the socket 7 and is provided with rackl teeth on one side thereof which mesh with -the teeth of a pinion 14 that is carried by a shaft 15. Th1s shaft is suitably journaled in the body 1 transversely of the stem or rack bar-13 at one'side thereofand has one end projecting through 'an' enlargement 16 formed onfone'side ofithe part land into a circularspace 17- without the outer end por tion of said enlargement. An index finger 18'is fixed to'the' shaft 15 within the space 17 and registers at its free end with an armnularmicrometer graduation scale which 1s formed on the base wall of the space 17 in concentric relation to the shaft 15. A lens or other transparent part 19 closes the outer 'endof the space 17. With the tool illustrated a movement of the plunger 8 sufli- 119 cient to impart a complete revolution to the" index finger 18 indicates a di-ametrical measurement of one inch.

A brake-rod 20 extends into the outer end of the body 1 lengthwise thereof and has its inner end terminating adjacent to the conically formed end 1 1 of the pinion 11. The outer end of the socket 21 in which the brakebar 20 is disposed is enlarged and contains a coiled compression spring 22, which encircles the brake-bar and acts against a shoulder thereon to normally retain the brake-bar at the outward limit of its movement, which limit is determined by the coaction of a collar 23 on the brake-bar with a plug 24 in the outer end of the socket. The outer end of the brake-bar projects through and without the plug 21, and is provided with a head or enlargement 2.5. An inward movement of the brake-bar 20 against the tension of the spring 22 forces its inner end into braking contact with the conical surface of the pinion 14 and locks the shaft 15 against turning until the brake-bar has been released, thus enabling the adjustment of the index finger 18 to be maintained so that a reading can be effected after the tool has been. removed from engagement with the work piece, the diameter of which is being determined.

The operation or my improved micrometer is as follows: For the purpose of illustration it will be considered that the present tool is adapted for determining the diameter of'work ranging in size from one to five inches. Such being the case, if work from one to two inches in diameter is to be meassured, the stems of the work coacting parts 5 are placed in engagement with the inner holes of the two sets. If work varying from two to three inches in diameter is to be measured the stems of the contact parts are inserted into the next holes in order. in the fork, as indicated in Fig. 1, the extent of movement of the stems into the respective holes being limited by the stepped formation of the stems. The work contacting parts having been placed inproper position in the fork or holder, said parts are forced over the work until both move into'contact therewith, thereby causing the work to coaet with the projected end of the plunger 8 and force it inward an extent depending upon the size of the work. The inward forcing of the plunger 8 imparts a revolutionary movement to the index finger 18, and the point on the scale at which the index finger steps will indicate a fraction of an inch proportional to an entire revolution of the finger, as each complete revolution indicates a full inch. In Figs. 1 and 2 the I work piece being measured is twoinches in diameter and the index finger' 18 stands at zero point on the scale. If a two and onehalf mch work piece is placed between the lines 0 and the plunger 8 will be moved inward a sufiicient distance to impart a half revolution to the index finger 18. The operator, knowingthat the work piece is between two and three inches in diameter will under stand from a reading of the micrometer scale that the work piece is two and one-half inches in diameter. If a three inch work piece is to be measured the stems of the contact parts 5 are placed'in engagement with the third set of holes 3 and the work piece assumes the position indicated by the dotted line (Z in Fig. 1. It is thus evident that the diameter of any work piece ranging from one to five inches in diameter can be quickly and accurately determined by the tool illus trated by merely adjusting the contact parts relative to the holder 1-2 as the size of the work may require.

I wish it, understood that my invention is not limited toany specific construction, ar- 'angement or form of the parts, as it is capable of numerous modifications without departing from the spirit of the invention.

Having thus described my invention, what I claim ,as new, and desire to secure by Letters Patent, is,

1. In a tool of the class described a forked holder, work contacting parts adjustably carried by thefork arms of said holder and having work coacting surfaces disposed in intersecting planes which diverge outwardly with respect to the fork crotch, said'surfaces serving to limit the movement of a work piece therebetween, and means operated by contact of the work therewith when placed between said contacting parts whereby to indicate the diameter of the work.

2. In a tool of the class described, a forked body, work contacting parts carried 'by the fork arms of said body for adjustment lengthwisethereof and in position-to permit a limited insertion of a work piece therebetween and means operable to indicate the diameter of the work piece when inserted a maximuinextent between said parts.

3. In a tool of the class described, a body having one end forked with ea ch arm of the fork provided with an opening, the axial line of which intersects with the axial line of the opening in the other arm at a pomt fallthe forked end I side of the line of movement of said plunger,

having a stem the holder in concentric relation to said graduations, an index finger carried by the shaft and registering with said graduations, a plunger mounted for yielding movements in one direction by said holder and projecting into the crotch of said fork, said plunger and shaft having rack and pinion parts whereby a longitudinal movement of the plunger imparts rotation to said shaft, and work contacting parts removably carried by of said holder, one at each said contacting parts serving to limit the movement of a work piece within the crotch of the holder. v

5. In a tool of the class described, a holder having a forked end with each arm of the of openings vary in size, a contact part for each arm for 1IlS8I'l210Dhat varying depths within different openings of the series, one of said contact parts being proand vided for each arm and cooperating with the other contact part to limit the insertion of a work piece within the fork ofsaid holder,

means with which a work piece has contact when inserted between said contact cate the diameter of the work piece.

6. In a tool of the class described, a-forked holder provided in each arm of its fork with a plurality of openings spaced longitudi :said contact parts,

nally of the arm and varying in size, a contact part for each arm, said contact parts having stepped stems for insertion at varying depths within the different sized openings within said arms, said contact parts cooperating to limit the extent of insertion of a workpiece Within the holder fork,-and means operable to indicate the diameter of a work piece Wheninserted between said contact'par'ts. 1

7. In a tool of the class described, a forked holder, means rotatably carried by said holder and operable to indicate the diameter of a work piece inserted a predetermined extent within the fork of said holder, and means operable tolock said rotatable indicator meansin any position to which it may be moved relative to the holder.

8. In a tool of the class described, a forked holder, Work contacting parts adjustably carried'by the forked end of said holder and serving to limit the insertion of a work piece within the fork of the holder, means having a rotatable part and automatically operable to indicate the diameter of a work piece when inserted the maximum extent between and means for co-acting with said rotatable part to lock said indicator means in any position to which it may be'moved relative to the holder.

In testimony whereof, I have hereunto signed my name to this specification.

, RALPH L. BINNEY. 

